Re: [Tinycc-devel] global variables in tcc

[Rob]

On Mon, Apr 01, 2013 at 01:20:22PM +0200, Lluís Batlle i Rossell wrote:
> Hello,
>
> I'm testing tcc 0.9.26, and I see that for global variables liek this:
> int x;
>
> It generates a 'B' symbols (nm naming). But gcc and clang generate 'C'
> symbols. That makes tcc generate errors (or warnings?) linking. It
> says error, but it links.
>
> Is this a tcc problem?
>
> Regards,
> Lluís.
>
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Shouldn't be - gcc and clang generate uninitialised globals via .comm,
meaning these can be overridden if the sizes and alignment are the same.
tcc doesn't, which is just as valid.

header.h:
        int i;

file1.c:
        #include "header.h"

file2.c:
        #include "header.h"

GCC and Clang allow these to be merged together at link-time, which
means users who make mistakes such as missing `extern' in header files
still get the multiple definitions merged.

tcc is stricter and perhaps more conformant in disallowing this.

Cheers,
Rob